Secretions From the Pistil of Lilium Longiflorum

Abstract

The pistil of Lilium longiflorum secretes two forms of exudate, one from the stigma surface and the other from the canal cavity. Electrophoretic studies of these exudates have revealed quantitative and qualitative differences in protein profiles. The exudatic components which are transferred to the cell wall by endoplasmic reticulum and Golgi vesicles, are stored within the cell wall of the secretive tissues and secreted from the cell walls directly. The cell wall structure of these secretive tissues differs. The canal cell wall has thick characteristic ingrowths that are supplied mainly from Golgi vesicles, while the papilla cell wall of the stigma is thinner, lacks ingrowths, and is supplied from ER vesicles.

Changes in the Amount and Composition of Stylar Canal Exudate after Self- or Cross-pollination in Self-incompatible Lilium longiflorum Thunb.

“…Secondly, the secretion is inhibited by self-pollination. Yamada (1965) and Miki-Hirosige et al (1987) showed histochemically that cross-pollination triggered the secretion of the canal exudate. In the present study, carbohydrate and protein contents of the canal exudate rather increased until 24 hr after self-pollination.…”

Ultrastructural study on the stylar transmitting tissue in Japanese pear

“…Secretion into the canal can thus occur rapidly depending on the acceptivity of the pollen tubes (Miki-Hirosige et al 1987). In our observations, while a slight expansion and diffusion of the cell wall are seen, neither the cell wall nor the periplasm has a structural similarity to their counterparts in Lilium.…”

Correlation between the Accumulation of Stylar Canal Exudate and the Diminution of Self-incompatibility in Aging Flowers of Lilium longiflorum.

“…These grafting results lead us to assume that compatible pollen tubes stimulate the glands of the canal to actively secrete and thereby promote their unhindered growth to the ovary. This assumption is that compatible pollen tubes trigger the secretion by canal surface cells lining the stylar canal is supported by histochemical observations (Miki-Hirosige et al, 1987;Yamada, 1965).…”